In een interview met The Guardian vertelde Freeman dat er oorspronkelijk plannen waren om het vierde seizoen in de herfst op te nemen: “I don’t know. Really. I wish I did. I thought the plan was to do it in the autumn but apparently that’s fallen away. We’re all busy. But I’m ready. I’m there. It depends if you want to make time for it. I hope we do. I love it.”

Mogelijk komt er in de tussentijd een special, vertelde Freeman: “Mark Gatiss may beat me up, but there is an idea for this one-off special that’s such a good idea, and as I was listening to it, I thought, ‘We’ve just got to do this,'” he told Cultbox. “And I don’t know when we are going to be able to do it, unfortunately. It’s a fantastic, really mouth-watering idea. But I really don’t know when we are going to get to do it.”